<template>
  <div class="player" v-show="playlist.length>0">
  	<transition name="normal"
				@enter = "enter"
				@after-enter="afterEnter"
				@leave="leave"
				@after-leave="afterLeave"
  	>
      <div class="normal-player" v-show="fullScreen">
        <div class="background">
          <img width="100%" height="100%" :src="currentSong.image">
        </div>
        <div class="top">
          <div class="back" @click="back">
            <i class="icon-back"></i>
          </div>
          <h1 class="title" v-html="currentSong.name"></h1>
          <h2 class="subtitle" v-html="currentSong.singer"></h2>
        </div>
        <div class="middle" 
        	 @touchstart.prevent='middleTouchStart' 
        	 @touchmove.prevent='middleTouchMove' 
        	 @touchend='middleTouchEnd' 
        >
          <div class="middle-l" ref="middlel">
            <div class="cd-wrapper" ref="cdWrapper">
              <div class="cd" :class="cdCls">
                <img class="image" :src="currentSong.image">
              </div>
            </div>
            <div class="playing-lyric-wrapper">
            	<div class="playing-lyric">{{playingLyric}}</div>
            </div>
          </div>
          <scroll class="middle-r" ref="lyricList" :data="currentLyric && currentLyric.lines">
          	<div class="lyric-wrapper">
          		<div v-if='currentLyric'>
          			<p class="text"
          			   :class='{"current" :currentLineNum === index}'
          			   ref="lyricLine"
          			   v-for="(line,index) in currentLyric.lines"
          	        >{{line.txt}}</p>
          		</div>
          	</div>
          </scroll>
        </div>
        <div class="bottom">
          <div class="dot-wrapper">
            <span class="dot" :class="{'active':currentShow ==='cd'}"></span>
            <span class="dot" :class="{'active':currentShow ==='lyric'}"></span>
          </div>
          <div class="progress-wrapper">
            <span class="time time-l">{{format(currentTime)}}</span>
            <div class="progress-bar-wrapper"> 
            	<progress-bar :percent='percent' @percentChange="onProgressBarChange"></progress-bar>             
            </div>
            <span class="time time-r">{{format(currentSong.duration)}}</span>
          </div>
          <div class="operators">
            <div @click="changeMode" class="icon i-left">
              <i :class="iconMode"></i>
            </div>
            <div class="icon i-left" :class="disableCls">
              <i @click="prev" class="icon-prev"></i>
            </div>
            <div class="icon i-center" :class="disableCls">
              <i @click="togglePlaying" :class="playIcon"></i>
            </div>
            <div class="icon i-right" :class="disableCls">
              <i @click="next" class="icon-next"></i>
            </div>
            <div class="icon i-right">
              <i class="icon" @click="toggleFavorite(currentSong)" :class="getFavoriteIcon(currentSong)"></i>
            </div>
          </div>
        </div>
      </div>
    </transition>
    <transition name="mini">
      <div class="mini-player" v-show="!fullScreen" @click="open">
        <div class="icon">
          <img width="40" height="40" :src="currentSong.image" :class="cdCls">
        </div>
        <div class="text">
          <h2 class="name" v-html="currentSong.name"></h2>
          <p class="desc"  v-html="currentSong.singer"></p>
        </div>
        <div class="control"> 
           <progress-circle :radius="radius" :percent="percent">
           	<i :class="miniIcon"
           	    @click.stop="togglePlaying"
				class="icon-mini"
           	></i>
           </progress-circle>         
        </div>
        <div class="control" @click.stop="showPlaylist">
          <i class="icon-playlist"></i>
        </div>
      </div>
    </transition>
    <playlist ref="playlist"></playlist>
    <audio 
          ref="audio" 
          :src="currentSong.url"
          @canplay="ready"
          @error="error"
          @timeupdate="updateTime"
          @ended = "end"
          ></audio>
  </div>
</template>

<script>
	import {mapGetters, mapMutations,mapActions} from 'vuex'
	import animations from 'create-keyframe-animation'
	import {prefixStyle} from 'common/js/dom'
	import ProgressBar from 'base/progress-bar/progress-bar'
	import ProgressCircle from 'base/progress-circle/progress-circle'
	import {playMode} from 'common/js/config'
	import {shuffle} from 'common/js/util'
	import Lyric from 'lyric-parser'
	import scroll from 'base/scroll/scroll'
	import Playlist from 'components/playlist/playlist'
	import {playerMixin} from 'common/js/mixin'

	const transform = prefixStyle('transform')
	const transitionDuration = prefixStyle('transitionDuration')
	export default {
		mixins: [playerMixin],
		data() {
			return {
				songReady: false,
				currentTime: 0,
				radius: 32,
				currentLyric: null,
				currentLineNum: 0,
				currentShow: 'cd',
				playingLyric: ''
			}
		},
		computed: {
			cdCls() {
				return this.playing ? 'play' :'play pause'
			},
			playIcon() {
				return this.playing? 'icon-pause' : 'icon-play'
			},
			iconMode() {
				return this.mode === playMode.sequence? 'icon-sequence':this.mode===playMode.loop?'icon-loop':'icon-random'
			},
			miniIcon() {
				return this.playing ? 'icon-pause-mini' :'icon-play-mini'
			},
			disableCls() {
				return this.songReady? '':'disable'
			},
			percent() {
				return this.currentTime/this.currentSong.duration
			},
			...mapGetters([
					'fullScreen',
					'playing',
					'currentIndex'
				])
		},
		created() {
			this.touch = {}
		},
		components: {
			ProgressBar,
			ProgressCircle,
			scroll,
			Playlist
		},
		methods: {
			back () {
				this.setFullScreen(false)
			},
			open () {
				this.setFullScreen(true)
			},
			enter(el,done) {
				const {x,y,scale} = this._getPostAndScale()
				let animation = {
					0: {
						transform: `translate3d(${x}px,${y}px,0) scale(${scale})`
					},
					60: {
						transform: `translate3d(0,0,0) scale(1.1)`
					},
					100: {
						transform: `translate3d(0,0,0) scale(1)`
					}
				}
				animations.registerAnimation({
					name: "move",
					animation,
					presets: {
						duration: 400,
						easing: 'linear'
					}
				})
				animations.runAnimation(this.$refs.cdWrapper,'move',done)
			},
			afterEnter() {
				animations.unregisterAnimation('move')
				this.$refs.cdWrapper.style.animation = ''
			},
			leave(el,done) {
				this.$refs.cdWrapper.style.transition = 'all 0.4s'
				const {x,y,scale} = this._getPostAndScale()
				this.$refs.cdWrapper.style[transform]= `translate3d(0,0,0) scale(${scale})`
				this.$refs.cdWrapper.addEventListener('transitionend',done)
			},
			afterLeave() {
				this.$refs.cdWrapper.style.transition = ''
				this.$refs.cdWrapper.style[transform] = ''
			},
			togglePlaying() {
				if(!this.songReady) {
					return
				}
				this.setPlayingState(!this.playing)
				if(this.currentLyric) {
					this.currentLyric.togglePlay()
				}
			},
			end() {
				if(this.mode === playMode.loop){
					this.loop()
				}else{
					this.next()
				}
			},
			loop() {
				this.$refs.audio.currentTime = 0
				this.$refs.audio.play()
				if(this.currentLyric) {
					this.currentLyric.seek()
				}
			},
			next() {
				if(!this.songReady) {
					return
				}
				if(this.playlist.length === 1) {
					this.loop()
				} else {
					let index = this.currentIndex + 1
					if(index === this.playlist.length) {
						index = 0
					}
					this.setCurrentIndex(index)
					if(!this.playing) {
						this.togglePlaying()
					}
				}
					this.songReady = false
			},
			prev() {
				if(!this.songReady) {
					return
				}
				if(this.playlist.length === 1){
					this.loop()
				} else {
					let index = this.currentIndex - 1
					if(index === -1) {
						index = this.playlist.length-1
					}
					this.setCurrentIndex(index)
					if(!this.playing) {
						this.togglePlaying()
					}
				}
				this.songReady = false
			},
			ready() {
				this.songReady= true
				this.savePlayHistory(this.currentSong)
			},
			error() {
				this.songReady = true
			},
			updateTime(e) {
				this.currentTime = e.target.currentTime
			},
			format(interval) {
				interval = Math.floor(interval)
				const minute = Math.floor(interval / 60)
				const second = this._pad(interval%60)
				return `${minute}:${second}`
			},
			onProgressBarChange(percent) {
				const currentTime = this.currentSong.duration * percent
				this.$refs.audio.currentTime = this.currentSong.duration * percent
				if(!this.playing){
					this.togglePlaying()
				}
				if(this.currentLyric) {
					this.currentLyric.seek(currentTime*1000)
				}
			},
			getLyric() {
				this.currentSong.getLyric().then((lyric) => {
					if (this.currentSong.lyric !== lyric) {
			            return
			        }
					this.currentLyric = new Lyric(lyric,this.handleLyric)
					if(this.playing) {
						this.currentLyric.play()
				    }	
				}).catch(() => {
					this.currentLyric = null
					this.playingLyric = ''
					this.currentLineNum = 0
				})
			},
			handleLyric({lineNum, txt}) {
				this.currentLineNum = lineNum
				if(lineNum > 5) {
					let lineEl = this.$refs.lyricLine[lineNum-5]
					this.$refs.lyricList.scrollToElement(lineEl,1000)
				} else {
					this.$refs.lyricList.scrollTo(0,0,1000)
				}
				this.playingLyric = txt
			},
			middleTouchStart(e) {
		        this.touch.initiated = true
		        const touch = e.touches[0]
		        this.touch.startX = touch.pageX
		        this.touch.startY = touch.pageY
		    },
		    middleTouchMove(e) {
		        if (!this.touch.initiated) {
		          return
		        }
		        const touch = e.touches[0]
		        const deltaX = touch.pageX - this.touch.startX
		        const deltaY = touch.pageY - this.touch.startY
		        if (Math.abs(deltaY) > Math.abs(deltaX)) {
		          return
		        }
		        if (!this.touch.moved) {
		          this.touch.moved = true
		        }
		        const left = this.currentShow === 'cd' ? 0 : -window.innerWidth
		        const offsetWidth = Math.min(0, Math.max(-window.innerWidth, left + deltaX))
		        this.touch.percent = Math.abs(offsetWidth/window.innerWidth)
		        this.$refs.lyricList.$el.style[transform] = `translate3d(${offsetWidth}px,0,0)`
		        this.$refs.lyricList.$el.style[transitionDuration] = 0
		        this.$refs.middlel.style.opacity = 1-this.touch.percent
		        this.$refs.middlel.style[transitionDuration] = 0
		    },
		    showPlaylist() {
		    	this.$refs.playlist.show()
		    },
		    middleTouchEnd() {
		        let offsetWidth
		        let opacity
		        if(this.currentShow === 'cd') {
		        	if(this.touch.percent>0.1) {
		        		offsetWidth = -window.innerWidth
		        		opacity = 0
		        		this.currentShow = 'lyric'
		        	} else　{
		        		offsetWidth = 0
		        		opacity = 1
		        	}
		        } else {
		        	if(this.touch.percent < 0.9) {
		        		offsetWidth = 0
		        		this.currentShow = 'cd'
		        		opacity = 1
		        	} else {
		        		offsetWidth = -window.innerWidth
		        		opacity = 0
		        	}
		        }
		        const time = 300
		         this.$refs.lyricList.$el.style[transform] = `translate3d(${offsetWidth}px,0,0)`
		          this.$refs.middlel.style.opacity = opacity
		         this.$refs.lyricList.$el.style[transitionDuration] = `${time}ms`
		         this.$refs.middlel.style[transitionDuration] = `${time}ms`
		    },
			_pad(num,n = 2) {
				let len = num.toString().length
				while(len<n) {
					num = '0' + num
					len ++
				}
				return num
			},
			_getPostAndScale() {
				const targetWidth = 40
				const paddingLeft = 40
				const paddingBottom = 30
				const paddingTop = 80
				const width = window.innerWidth *0.8
				const scale=targetWidth/width
				const x=-(window.innerWidth/2-paddingLeft)
				const y = window.innerHeight-paddingTop-width/2-paddingBottom
				return {
					x,
					y,
					scale
				}
			},
			...mapMutations({
				setFullScreen: 'SET_FULL_SCREEN',
				setPlayingState: 'SET_PLAYING_STATE',
				setCurrentIndex: 'SET_CURRENT_INDEX',
				setPlayMode: 'SET_PLAY_MODE',
				setPlaylist: 'SET_PLAYLIST',

			}),
			...mapActions([
				'savePlayHistory'
				])
		},
		watch: {
			currentSong(newSong,oldSong) {
				if(newSong.id === oldSong.id) {
					return
				}
				if(this.currentLyric) {
					this.currentLyric.stop()
				}
				setTimeout(()=> {
					this.$refs.audio.play()
					this.getLyric()
				}, 1000)	
			},
			playing(newPlaying) {
				const audio = this.$refs.audio
				this.$nextTick(()=> {
					newPlaying? audio.play() : audio.pause()
				})	
			}
		}
		
	}
</script>

<style lang="stylus" scoped>
  @import "~common/stylus/variable"
  @import "~common/stylus/mixin"

  .player
    .normal-player
      position: fixed
      left: 0
      right: 0
      top: 0
      bottom: 0
      z-index: 150
      background: $color-background
      .background
        position: absolute
        left: 0
        top: 0
        width: 100%
        height: 100%
        z-index: -1
        opacity: 0.6
        filter: blur(20px)
      .top
        position: relative
        margin-bottom: 25px
        .back
          position absolute
          top: 0
          left: 6px
          z-index: 50
          .icon-back
            display: block
            padding: 9px
            font-size: $font-size-large-x
            color: $color-theme
            transform: rotate(-90deg)
        .title
          width: 70%
          margin: 0 auto
          line-height: 40px
          text-align: center
          no-wrap()
          font-size: $font-size-large
          color: $color-text
        .subtitle
          line-height: 20px
          text-align: center
          font-size: $font-size-medium
          color: $color-text
      .middle
        position: fixed
        width: 100%
        top: 80px
        bottom: 170px
        white-space: nowrap
        font-size: 0
        .middle-l
          display: inline-block
          vertical-align: top
          position: relative
          width: 100%
          height: 0
          padding-top: 80%
          .cd-wrapper
            position: absolute
            left: 10%
            top: 0
            width: 80%
            height: 100%
            .cd
              width: 100%
              height: 100%
              box-sizing: border-box
              border: 10px solid rgba(255, 255, 255, 0.1)
              border-radius: 50%
              &.play
                animation: rotate 20s linear infinite
              &.pause
                animation-play-state: paused
              .image
                position: absolute
                left: 0
                top: 0
                width: 100%
                height: 100%
                border-radius: 50%

          .playing-lyric-wrapper
            width: 80%
            margin: 30px auto 0 auto
            overflow: hidden
            text-align: center
            .playing-lyric
              height: 20px
              line-height: 20px
              font-size: $font-size-medium
              color: $color-text-l
        .middle-r
          display: inline-block
          vertical-align: top
          width: 100%
          height: 100%
          overflow: hidden
          .lyric-wrapper
            width: 80%
            margin: 0 auto
            overflow: hidden
            text-align: center
            .text
              line-height: 32px
              color: $color-text-l
              font-size: $font-size-medium
              &.current
                color: $color-text
      .bottom
        position: absolute
        bottom: 50px
        width: 100%
        .dot-wrapper
          text-align: center
          font-size: 0
          .dot
            display: inline-block
            vertical-align: middle
            margin: 0 4px
            width: 8px
            height: 8px
            border-radius: 50%
            background: $color-text-l
            &.active
              width: 20px
              border-radius: 5px
              background: $color-text-ll
        .progress-wrapper
          display: flex
          align-items: center
          width: 80%
          margin: 0px auto
          padding: 10px 0
          .time
            color: $color-text
            font-size: $font-size-small
            flex: 0 0 30px
            line-height: 30px
            width: 30px
            &.time-l
              text-align: left
            &.time-r
              text-align: right
          .progress-bar-wrapper
            flex: 1
        .operators
          display: flex
          align-items: center
          .icon
            flex: 1
            color: $color-theme
            &.disable
              color: $color-theme-d
            i
              font-size: 30px
          .i-left
            text-align: right
          .i-center
            padding: 0 20px
            text-align: center
            i
              font-size: 40px
          .i-right
            text-align: left
          .icon-favorite
            color: $color-sub-theme
      &.normal-enter-active, &.normal-leave-active
        transition: all 0.4s
        .top, .bottom
          transition: all 0.4s cubic-bezier(0.86, 0.18, 0.82, 1.32)
      &.normal-enter, &.normal-leave-to
        opacity: 0
        .top
          transform: translate3d(0, -100px, 0)
        .bottom
          transform: translate3d(0, 100px, 0)
    .mini-player
      display: flex
      align-items: center
      position: fixed
      left: 0
      bottom: 0
      z-index: 180
      width: 100%
      height: 60px
      background: $color-highlight-background
      &.mini-enter-active, &.mini-leave-active
        transition: all 0.4s
      &.mini-enter, &.mini-leave-to
        opacity: 0
      .icon
        flex: 0 0 40px
        width: 40px
        padding: 0 10px 0 20px
        img
          border-radius: 50%
          &.play
            animation: rotate 10s linear infinite
          &.pause
            animation-play-state: paused
      .text
        display: flex
        flex-direction: column
        justify-content: center
        flex: 1
        line-height: 20px
        overflow: hidden
        .name
          margin-bottom: 2px
          no-wrap()
          font-size: $font-size-medium
          color: $color-text
        .desc
          no-wrap()
          font-size: $font-size-small
          color: $color-text-d
      .control
        flex: 0 0 30px
        width: 30px
        padding: 0 10px
        .icon-play-mini, .icon-pause-mini, .icon-playlist
          font-size: 30px
          color: $color-theme-d
        .icon-mini
          font-size: 32px
          position: absolute
          left: 0
          top: 0

  @keyframes rotate
    0%
      transform: rotate(0)
    100%
      transform: rotate(360deg)	
</style>